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In an ideal world, it would also allow buildingoccupiers to compare meter readings to predicted values to help to identify whether there is faulty equipment or the building is being operated incorrectly. As it stands, the "performance gap" makes this difficult. ENE 01 under BREEAM 2018 aims to start to address this.

4. Calculate whether metering of individual systems covers at least 90 % of each energy/fuel consumption. Consumption of systems/areas without metering can be calculated based on deduction of other sub-metered values or based on operating hours, installed load etc.

Where the sum of sub-metered consumption is less than 90% additional sub-metering is needed. For more guidance see CIBSE guidelines, especially General Information Leaflet 65 (link below) with easily understandable diagrams and schemes.

5. Define the scale of the building for correct metering system selection:

GIFA > 1 000 m2: all meters to be connected to the appropriate energy monitoring and management system;

GIFA < 1 000 m2: all meters to be either connected to the energy monitoring and management system or with separate accessibleenergy sub-meters with pulsed or other open protocol communication outputs.

6. Ensure that meters will be easily identifiable to the building users (Property, Facility or Office Manager) through meters labelling and/or BMS designation.

IT work and study rooms, including IT-equipped library space and any space with provision of more than one computer terminal per 5m².
Individual sub-metering of standard classrooms or seminar rooms is not required.

Double-check that the evidence provided matches up to what you know is included in the building design and is streamlined with other pieces of evidence, e.g. if another piece of evidence shows a café/catering facility on site, make sure this has adequate sub-metering for its scope.

Sub-metering, in particular with connection to a BMS/energy monitoring and management system, tends to be something a design team automatically incorporate into the design of a larger building. Where smaller buildings are concerned bear in mind that anything up to 200m2 can have just one meter for electricity and one for heating purposes.

Sub-meters aren't particularly expensive in the grand scheme of things.

Appropriate metering schedule should be incorporated into the building to be able in a future achieve also the BREEAM In-Use energy monitoring issues credits without any additional cost for sub-metering improvement afterwards.

Worthwhile asking the M&E engineers to check their Design Stage evidence prior to the site visit (just in case there have been any major changes you need to look out for!), an As Built issue of the schematics/layouts would be useful to include as evidence.

Whilst on site, take photographs of meters and sub-meters, showing labelling/connection to the energy monitoring and management system. You could also take photographs of the energy monitoring and management system screen to demonstrate that the energy consuming systems are metered appropriately.

The guidelines collated in this ISD aim to support sustainablebest practice in the topic described. This issue may apply in multiple BREEAM schemes covering different stages in the life of a building, different building types and different year versions. Some content may be generic but scheme nuances should also be taken into account. Refer to the comments below and related articles to this one to understand these nuances. See this document for further guidelines